安徽涡河沿岸土壤氟含量特征及其影响因素

Characteristics and influencing factors of fluorine content in soils along the Guohe River in Anhui Province

通过系统采集0~20 cm表层土壤、水平剖面土壤及0~200 cm垂向剖面土壤样品,测定土壤氟及相关指标含量,研究表层土壤及剖面土壤氟含量分配分布特征及其影响因素。结果表明,研究区表层土壤中氟含量范围为448×10^-6~1 009×10^-6,平均含量为685×10^-6。表层土壤氟含量分配分布特征受地质、地貌制约明显,氟高背景土壤(>730×10^-6)集中分布于蚌埠组(Qhb)亚黏土内,地貌为泛滥坡平地。表层土壤氟与TFe2O3(r=0.76)、Mn(r=0.79)、CaO(r=0.66)及Al2O3(r=0.59)呈正相关,与w(SiO2)/w(Al2O3)呈负相关。垂向剖面上,土壤氟主要富集于0~155 cm,铁、锰氧化物为制约土壤氟垂向分布的重要因素。

The 0~20 cm surface soil, the horizontal profile soil and the 0~200 cm vertical profile soil samples were collected systematically to determine the content of soil fluoride and related indicators, and the distribution characteristics and influencing factors of soil fluorine content in surface soil and profile soil were studied. The results show that the fluorine content in the surface soil of the study area ranges from 448×10^-6 to 1 009×10^-6, with the average content being 685×10^-6. The distribution characteristics of fluorine content in surface soil are obviously restricted by geological and geomorphological conditions. The soil with high fluoride background(>730×10^-6) is concentrated in the sub-clay of Qhb group, and the landform is flood plain.The surface soil fluorine is positively correlated with TFe2O3(r=0.76), Mn(r=0.79), CaO(r=0.66) and Al2O3(r=0.59), and negatively correlated with w(SiO2)/w(Al2O3).In the vertical section, soil fluorine is mainly concentrated in 0~155 cm. Iron and manganese oxides are important factors that restrict the vertical distribution of soil fluorine.